1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Using frist order perturbation theory to the the energy change in the ground state

  1. Apr 29, 2010 #1
    A particle is in the ground state in a one-dimensional box given by the potential

    v(x)= 0 for 0<x<a
    v(x)= inifinity other wise

    A small perturbation V = V(0)x/a is now introduced. Show, correct to first order in perturbation theory, hat the energy change in the ground state is V(0)/2

    the normalised wavefuctions of v(x) are PHi(n)=(sqrt(2/a))sin(n(pi)x/a)

    i have looked up what i can on perturbation theory, and i can't get to doing this question,

    if anyone could give me a few pointers on what to do and where to start, that would be great.
    Last edited: Apr 29, 2010
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted